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When „Auto Update Statistics“ will not update your statistics

von Uwe Ricken | Jan. 8, 2025 | SQL Blog

The database option „Auto Update Statistics“ ensures that statistics are automatically updated when a threshold is reached. Under certain conditions, these updated statistics are not considered Why is that? Statistics The query optimizer uses statistics to...

Pleasant side effect of EXISTS vs. JOIN

von Uwe Ricken | Jan. 3, 2025 | DB Engine, Indexierung, SQL Blog, Tipps und Tricks

This blog post was inspired by a post by Eric Darling on LinkedIn, where he shared his video on the topic of [NOT] EXISTS. A pleasant side effect of using EXISTS over JOIN concerns automatically created statistics in Microsoft SQL Server. Task description Find all...

db SQL Blog

  • Table Hint UPDLOCK and LOCK ESCALATION
  • Auto Update Statistics and Trivial Execution Plans
    Execution process of trivial plans with simple parameterization
  • When „Auto Update Statistics“ will not update your statistics
  • Is SWITCH PARTITION a bad idea?
  • Pleasant side effect of EXISTS vs. JOIN
  • INDEX REBUILD is not FREEPROCCACHE
  • Automatically Created Statistics – know the caveats
  • Temporary Table or Table Variable, that is the question.
  • AUTO_UPDATE_STATISTICS and thresholds
  • Helper function for determining the update threshold for statistics
  • Partitioning and LOCK_ESCALATION = AUTO
  • The role of a DBA is NOT Tuning but Operations
  • Foreign Key Constraints – JOIN Elimination
  • Foreign Key Constraints – Part II
  • Use Foreign Key Constraints in your Databases – Part I
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